The energy in most ecosystmes comes from a green plants b the sun c wind d rain water?

The sun provides most of the energy

the sun

Explanation:

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.